Iron is extracted from the mineral magnetite, Fe3O4:

Question

Fe3O4 (s) + 2 C (s)  3 Fe (s) + 2 CO2 (s)
A 35.0 g sample of magnetite is reacted with 4.0 g of carbon, and 15.0 g of iron is produced.
Determine the percentage yield of this reaction. (6)

Answer 1

molar mass of Fe3O4 ... 232 g

molar mass of C ... 12.0 g

molar mass of Fe ... 55.8 g

find the moles reacted , and the moles produced
... divide by the appropriate molar mass

carbon is the limiting reactant

theoretical yield (from the reaction equation) is 3 moles of Fe for every 2 moles of C

what % of the theoretical occurred?